C1211 – ABS Indicator Lamp Circuit Malfunction
C1214 – System Relay Contact or Coil Circuit Open
C1217 – Pump Motor Shorted to Ground
C1218 – Pump Motor Circuit Shorted to Voltage or Motor Ground Open
C1221 – Left Front Wheel Speed Sensor Input Signal is 0
C1222 – Right Front Wheel Speed Sensor Input Signal is 0
C1223 – Left Rear Wheel Speed Sensor Input Signal is 0
C1224 – Right Rear Wheel Speed Sensor Input Signal is 0
C1225 – Left Front Excessive Wheel Speed Variation
C1226 – Right Front Excessive Wheel Speed Variation
C1227 – Left Rear Excessive Wheel Speed Variation
C1228 – Right Rear Excessive Wheel Speed Variation
C1232 – Left Front Wheel Speed Circuit Open or Shorted
C1233 – Right Front Wheel Speed Circuit Open or Shorted
C1234 – Left Rear Wheel Speed Circuit Open or Shorted
C1235 – Right Rear Wheel Speed Circuit Open or Shorted
C1236 – Low System Supply Voltage
C1237 – High System Supply Voltage
C1238 – Brake Thermal Model Exceeded
C1241 – Variable Effort Steering Circuit Malfunction
C1242 – Pump Motor Circuit Open
C1243 – BPMV Pump Motor Stalled
C1244 – Powertrain Indicated Engine Drag Control Malfunction
C1246 – Brake Lining Wear Circuit Open
C1248 – EBCM Turned the Red Brake Warning Indicator On
C1251 – RSS Indicated Malfunction
C1252 – Left Front Normal Force Malfunction
C1253 – Right Front Normal Force Malfunction
C1254 – Abnormal Shutdown Detected
C1255 – EBCM Internal Malfunction
C1256 – EBCM Internal Malfunction
C1261 – Left Front Inlet Valve Solenoid Malfunction
C1262 – Left Front Outlet Valve Solenoid Malfunction
C1263 – Right Front Inlet Valve Solenoid Malfunction
C1264 – Right Front Outlet Valve Solenoid Malfunction
C1265 – Left Rear Inlet Valve Solenoid Malfunction
C1266 – Left Rear Outlet Valve Solenoid Malfunction
C1267 – Right Rear Inlet Valve Solenoid Malfunction
C1268 – Right Rear Outlet Valve Solenoid Malfunction
C1271 – Left Front TCS Master Cylinder Isolation Valve Malfunction
C1272 – Left Front TCS Prime Valve Malfunction
C1273 – Right Front TCS Master Cylinder Isolation Valve Malfunction
C1274 – Right Front TCS Prime Valve Malfunction
C1276 – Delivered Torque Signal Circuit Malfunction
C1277 – Requested Torque Signal Circuit Malfunction
C1278 – TCS Temporarily Inhibited By PCM
C1281 – VSES Sensors Uncorrelated
C1282 – Yaw Rate Sensor Bias Circuit Malfunction
C1283 – Excessive Time to Center Steering
C1284 – Lateral Accelerometer Sensor Bias Malfunction
C1285 – Lateral Accelerometer Sensor Circuit Malfunction
C1286 – Steering Sensor Bias Malfunction
C1287 – Steering Sensor Rate Malfunction
C1288 – Steering Sensor Circuit Malfunction
C1291 – Open Brake Lamp Switch Contacts During Deceleration
C1292 – Brake Fluid Pressure Sensor Circuit
C1293 – Code C1291 Set in Previous Ignition Cycle
C1294 – Brake Lamp Switch Circuit Always Active
C1295 – Brake Lamp Switch Circuit Open
C1296 – Brake Fluid Pressure Sensor Circuit
C1297 – PCM Indicated Brake Extended Travel Switch Failure
C1298 – PCM Class 2 Serial Data Link Malfunction
C1326 – Battery Out of Range
C1650 – RSS Control Module Fault
C1658 – RSS Control Module Calibration Fault
C1710 – Left Front Damper Actuator Short Circuit to Battery
C1711 – Left Front Damper Actuator Short Circuit to Ground
C1712 – Left Front Damper Actuator Open Circuit
C1715 – Right Front Damper Actuator Short Circuit to Battery
C1716 – Right Front Damper Actuator Short Circuit to Ground
C1717 – Right Front Damper Actuator Open Circuit
C1720 – Left Rear Damper Actuator Short Circuit to Battery
C1721 – Left Rear Damper Actuator Short Circuit to Ground
C1722 – Left Rear Damper Actuator Open Circuit
C1725 – Right Rear Damper Actuator Short Circuit to Battery
C1726 – Right Rear Damper Actuator Short Circuit to Ground
C1727 – Right Rear Damper Actuator Open Circuit
C1735 – Compressor Relay Short to Battery
C1736 – Compressor Relay Short to GND/Open Circuit
C1737 – Exhaust Solenoid Valve Short to Battery
C1738 – Exhaust Solenoid Valve Short to GND
C1743 – Speed Signal Fault
C1744 – Lift/Dive Signal Discrete Fault
C1760 – Left Front Position Sensor Input Fault
C1761 – Right Front Position Sensor Input Fault
C1762 – Left Rear Position Sensor Input Fault
C1763 – Right Rear Position Sensor Input Fault
C1768 – Position Sensor Supply Fault
C1780 – Loss of Steering Position Signal
C1782 – ICCS2 DL Left Output Short Circuit to Bat
C1783 – ICCS2 DL Left Output Short Circuit to GND
C1784 – ICCS2 DL Right Output Short Circuit to Bat
C1785 – ICCS2 DL Right Output Short Circuit to GND
C1786 – Damper Control Relay Fault
C1787 – Damper Control Relay Short to GND
C1788 – Damper Control Relay Short to Bat
C0000 – Vehicle Speed Information Circuit Malfunction
C0035 – Left Front Wheel Speed Circuit Malfunction
C0040 – Right Front Wheel Speed Circuit Malfunction
C0041 – Right Front Wheel Circuit Range/Performance (EBCM)
C0045 – Left Rear Wheel Speed Circuit Malfunction
C0046 – Left Rear Wheel Speed Sensor Circuit Range/Performance (EBCM)
C0050 – Right Rear Wheel Speed Circuit Malfunction
C0051 – LF Wheel Speed Sensor Circuit Range/Performance (EBCM)
C0060 – Left Front ABS Solenoid #1 Circuit Malfunction
C0065 – Left Front ABS Solenoid #2 Circuit Malfunction
C0070 – Right Front ABS Solenoid #1 Circuit Malfunction
C0075 – Right Front ABS Solenoid #2 Circuit Malfunction
C0080 – Left Rear ABS Solenoid #1 Circuit Malfunction
C0085 – Left Rear ABS Solenoid #2 Circuit Malfunction
C0090 – Right Rear ABS Solenoid #1 Circuit Malfunction
C0095 – Right Rear ABS Solenoid #2 Circuit Malfunction
C0110 – Pump Motor Circuit Malfunction
C0121 – Valve Relay Circuit Malfunction
C0128 – Low Brake Fluid Circuit Low
C0141 – Left TCS Solenoid #1 Circuit Malfunction
C0146 – Left TCS Solenoid #2 Circuit Malfunction
C0151 – Right TCS Solenoid #1 Circuit Malfunction
C0156 – Right TCS Solenoid #2 Circuit Malfunction
C0161 – ABS/TCS Brake Switch Circuit Malfunction
C0221 – Right Front Wheel Speed Sensor Circuit Open
C0222 – Right Front Wheel Speed Signal Missing
C0223 – Right Front Wheel Speed Signal Erratic
C0225 – Left Front Wheel Speed Sensor Circuit Open
C0226 – Left Front Wheel Speed Signal Missing
C0227 – Left Front Wheel Speed Signal Erratic
C0229 – Drop Out of Front Wheel Speed Signals
C0235 – Rear Wheel Speed Signal Circuit Open
C0236 – Rear Wheel Speed Signal Circuit Missing
C0237 – Rear Wheel Speed Signal Erratic
C0238 – Wheel Speed Mismatch
C0241 – EBCM Control Valve Circuit
C0245 – Wheel Speed Sensor Frequency Error
C0254 – EBCM Control Valve Circuit
C0265 – EBCM Relay Circuit
C0266 – EBCM Relay Circuit
C0267 – Pump Motor Circuit Open/Shorted
C0268 – Pump Motor Circuit Open/Shorted
C0269 – Excessive Dump/Isolation Time
C0271 – EBCM Malfunction
C0272 – EBCM Malfunction
C0273 – EBCM Malfunction
C0274 – Excessive Dump/Isolation Time
C0279 – Powertrain Configuration Not Valid
C0281 – Brake Switch Circuit
C0283 – Traction Switch Shorted to Ground
C0284 – EBCM Malfunction
C0286 – ABS Indicator Lamp Circuit Shorted to B+
C0287 – Delivered Torque Circuit
C0288 – Brake Warning Lamp Circuit Shorted to B+
C0290 – Lost Communications With PCM
C0292 – Lost Communications With PCM
C0291 – Lost Communications With BCM
C0297 – Powertrain Configuration Data Not Received
C0298 – Powertrain Indicated Traction Control Malfunction
C0300 – Rear Speed Sensor Malfunction
C0305 – Front Speed Sensor Malfunction
C0306 – Motor A or B Circuit
C0308 – Motor A/B Circuit Low
C0309 – Motor A/B Circuit High
C0310 – Motor A/B Circuit Open
C0315 – Motor Ground Circuit Open
C0321 – Transfer Case Lock Circuit
C0323 – T-Case Lock Circuit Low
C0324 – T-Case Lock Circuit High
C0327 – Encoder Circuit Malfunction
C0357 – Park Switch Circuit High
C0359 – Four Wheel Drive Low Range (4LO) Discrete Output Circuit
C0362 – 4LO Discrete Output Circuit High
C0367 – Front Axle Control Circuit High
C0374 – General System Malfunction
C0376 – Front/Rear Shaft Speed Mismatch
C0379 – Front Axle System
C0387 – Unable to Perform Shift
C0472 – Steering Handwheel Speed Sensor Signal V Low
C0473 – Steering Handwheel Speed Sensor Signal V High
C0495 – EVO Tracking Error
C0498 – Steering Assist Control Actuator Feed Circuit Low
C0499 – Steering Assist Control Solenoid Feed Circuit High
C0503 – Steering Assist Control Solenoid Return Circuit Low
C0504 – Steering Assist Control Solenoid Return Circuit High
C0550 – ECU Malfunction – internal write / checksum malfunction
C0559 – EEPROM Checksum Error
C0563 – Calibration ROM Checksum Error
C0577 – Left Front Solenoid Circuit Low
C0578 – Left Front Solenoid Circuit High
C0579 – Left Front Solenoid Circuit Open
C0582 – Right Front Solenoid Circuit Low
C0583 – Right Front Solenoid Circuit High
C0584 – Right Front Solenoid Circuit Open
C0587 – Left Rear Solenoid Circuit Low
C0588 – Left Rear Solenoid Circuit High
C0589 – Left Rear Solenoid Circuit Open
C0592 – Right Rear Solenoid Circuit Low
C0593 – Right Rear Solenoid Circuit High
C0594 – Right Rear Solenoid Circuit Open
C0611 – VIN Information Error
C0615 – Left Front Position Sensor Malfunction
C0620 – Right Front Position Sensor Malfunction
C0625 – Left Rear Position Sensor Malfunction
C0628 – Level Control Position Sensor Circuit High
C0630 – Right Rear Position Sensor Malfunction
C0635 – Left Front Normal Force Circuit Malfunction
C0638 – Left Front Normal Force Circuit High
C0640 – Right Front Normal Force Circuit Malfunction
C0643 – Right Front Normal Force Circuit High
C0655 – Level Control Compressor Relay Malfunction
C0657 – Level Control Compressor Circuit Low
C0658 – Level Control Compressor Circuit High
C0660 – Level Control Exhaust Valve Circuit Malfunction
C0662 – Level Control Exhaust Valve Circuit Low
C0663 – Level Control Exhaust Valve Circuit High
C0665 – Chassis Pitch Signal Circuit
C0690 – Damper Control Relay Circuit Malfunction
C0691 – Damper Control Relay Circuit Range
C0693 – Damper Control Relay Circuit High
C0695 – Position Sensor Overcurrent (8 volt supply)
C0696 – Position Sensor Overcurrent (5 volt supply)
C0710 – Steering Position Signal Malfunction
C0750 – Tire Pressure Monitor (TPM) system sensor not transmitting
C0755 – Tire Pressure Monitor (TPM) system sensor not transmitting
C0760 – Tire Pressure Monitor (TPM) system sensor not transmitting
C0765 – Tire Pressure Monitor (TPM) system sensor not transmitting
C0800 – Device Power #1 Circuit Malfunction
C0896 – Electronic Suspension Control (ESC) voltage is outside the normal range of 9 to 15.5 volts
System Too Lean – Bank 1
Description:
How does a P0171 code trigger the check engine light? This code will trigger the check engine light as follows:
The adaptive fuel strategy in the vehicle’s computer constantly monitors the fuel delivery system to make sure the engine is running at an optimum air to fuel ratio, which is 14.7:1. The computer adjusts injector pulse width to regulate the amount of fuel going into the engine. The oxygen sensors relay information to the Powertrain Control Module (computer), informing it of the oxygen content in the exhaust. This information is translated by the computer, and used to determine if more or less fuel is needed. The computer will then adjust fuel flow (and possibly other related engine operating characteristics), to keep the correct air fuel mixture. This loop continues as long as the engine is running. Please refer to our article Oxygen Sensor Code Diagnosis for more info on this system. A P0171 check engine light code is set when the computer has reached a rich calibration limit and can not add enough fuel to maintain the correct mixture.
Possible Causes:
Refer to our Oxygen Sensor Code Diagnosis article for a list of all possible causes. The following is an overview of P0171 check engine light code possible causes.
Fuel System:
Leaking or faulty fuel pressure regulator
Plugged or dirty fuel filter or lines
Fuel pump weak or defective check valve
Injectors leaking or faulty
Low fuel pressure or running out of fuel
Leaking EVAP system components
Faulty FRP (Fuel Rail Pressure Sensor)
Air Intake System
Vacuum leaks
Contaminated, damaged or faulty Mass Air Flow sensor
PCV valve leak or stuck open
Air induction turbulance caused by wrong filter
Oil dipstick not seated
Air leaks after the Mass Air Flow Sensor (MAF)
Oil coated aftermarket air filter
Exhaust System
Any exhaust leak before or near the oxygen sensors
EGR System
Vacuum line disconnected from EGR System Module (ESM)
EGR valve, tube or gasket leak
EGR vacuum regulator valve leaking
Secondary Air Injection System
Mechanically stuck secondary air injection valve
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